We present a procedure to perform and interpret pull-off force measurements during the jump-off-contact process between a liquid drop and rough surfaces using a conventional atomic force microscope. In this method, a micrometric liquid mercury drop is attached to an AFM tipless cantilever to measure the force required to pull this drop off a rough surface. We test the method with two surfaces: ...

Biological adhesive contacts are usually of hierarchical structures, such as the clustering of hundreds of sub-micrometre spatulae on keratinous hairs of gecko feet, or the clustering of molecular bonds into focal contacts in cell adhesion. When separating these interfaces, releasable adhesion can be accomplished by asymmetric alignment of the lowest scale discrete bonds (such as the inclined s...

In this paper, we propose the design of low power level-converting retention flip-flop (RFF)using LSSR technique for Zigbee System-onchips (SoCs).The proposed retention flip-flop allows the voltage regulator which generates the core supply voltage (VDD, core) is turned off during the standby mode and thus reduces the standby power and dc current of the Zigbee SoCs. This method is the combinatio...

In order to characterize very weak adhesive surfaces, we have developed a quantitative test inspired by the Johnson, Kendall, and Roberts adhesion test for soft adhesives, which relies on the formation and then the rupture of a capillary bridge between the surface to be tested and a liquid bath. Both the shape and the kinetics of breakage of the capillary bridge for various coatings put into co...

The JKR (Johnson–Kendall–Roberts) method is widely used to measure the work of adhesion between soft materials. In this article, the JKR theory is summarized and three-dimensionless parameters are proposed to design a proper JKR experiment. The study of adhesion between two commonly used soft elastomers PDMS (Sylgard 184) and Ecofl ex 0300 are obtained with the measured pull-in and pull-off for...